#!/usr/bin/perl -w
use strict;

my %hoh_test;


$hoh_test{foo1}{bar} = -0.12697;
$hoh_test{foo1}{baz} = -0.000398154;
$hoh_test{foo2}{bar} = -4.0183e-05;
$hoh_test{foo2}{baz} = 0;
$hoh_test{foo3}{bar} = 9.966003977e-06;
$hoh_test{foo3}{baz} = 0.0001939;

# sort descending by value
foreach my $foo (keys(%hoh_test))
{
	foreach my $ba (sort {$hoh_test{$foo}{$b} <=> $hoh_test{$foo}{$a}} keys(%{$hoh_test{$foo}}))
	{
		printf("foo: $foo, ba: $ba, value: %s\n", $hoh_test{$foo}{$ba});
	}
}

##</code><code>##

foo: foo3, ba: baz, value: 0.0001939
foo: foo3, ba: bar, value: 9.966003977e-06
foo: foo2, ba: baz, value: 0
foo: foo2, ba: bar, value: -4.0183e-05
foo: foo1, ba: baz, value: -0.000398154
foo: foo1, ba: bar, value: -0.12697